I was happy to get your letter. Sorry, I have not written for so long because I have been busy at school preparing for my exams.
In your letter you speak how you can earn money on holiday. I think it is a good idea to work as a currier. I have done summer jobs such as: putting up ads and packaging products. I think you could do the other jobs, for example, handing out flyers, glue ads.
You decided working at your uncle's office. What will you do? Whom you work at your uncle's office?Does your uncle agree taking you to work?